Rotary pulverizer



(No Model.)

J. 0,. STEWART. ROTARY PULVERIZER'.

Patented June 6, 1882.

N. vzrzns Phnla-Umugnpher. Wasllinglan. u. c

I UNITED STATES PATENT OFFICE.

JAMES o. STEWART, or ALAMEDA, CALIFORNIA.

ROTARY PU LVERIZER.

SPECIFICATION. forming part of Letters Patent No. 258,953, dated June 6, 1.882.

' mime... filed July 29, 1861, (No model.)

To all whom it may concern v Be it known that I, JAMES O. STEWART,Of Alameda, Alameda county, in the State of California, have invented certain new and useful Improvements in Rotary Pulverizers; and I do hereby declare that the following is afull,

clear, and exact description thereof, reference being bad to the accompanying drawings.-

My invention has reference to that class of 1 o pulverizers in which the ore or other substance is pulverized by the action of metallic 'ballsin a rotary barrel or cylinder.

It relates to the construction of the rim of thebarrel and the arrangementof the grinding r 5 and screening surfaces, my object being to provide such a construction of these parts that the barrel can be cheaply made, and at the same time secure such an arrangement of the surfaces and screens that the pulverizing and 2 screening operations are greatly facilitated.

Referring to the accompanying drawings, Figure 1 is a transverse section through my improved cylinder, showing the inside of one of the ends. Fig. 2 is a top View of the cylinder with one of the screens removed. Fig. 3 is an outside view of a portion of one of the ends. Figs. 4 and 5 are details of the binding and grinding plates. Figs. 6 and 7 are details of the grate. Fig. 8 is a view showing the manner of securing the segmental plates to the journal.

In the construction of my rotary barrel I cast the ends in several segmental sections, A

A, each of which is cast with an outward-projecting flange, b, at each edge, as indicated in Figs. 3 and 8, so that when the sections are placed together edge to edge they can be secured by bolts passing through theflanges.

The trunnion C, I cast with two'flanges, d e,

49 close together, near oneend, and the central edges of the sections A A are inserted between them in putting the machine together, after which I bolt the flanges and sections together by bolts f, so that the trunnions are firmly secured to the sides.

The rim of the barrel consists of alternate grinding and binding plates H, which extend entirely across the barrel from end to end, and intermediate grates or parallel bars, I, arranged 5 transversely between each two grinding and binding plates. The screens J are secured outside of the grate or bars I, as shown at Fig.

1. Thus rigid rims J are bolted to the flange mand to aflange on the inserted plates J Each grinding and-bindin g plate H, I cast with 5 5 a groove, 1, in each edge and a projecting flange, in, extending outward from each outside edge, as shown at Fig. 5. The screen-bars I are each cast with a shoulder, 8, near each end of one side, and with a recess, 1., near one end on the opposite side, so that when they are placed together the shouldered edge of one bar will come against the recessed edge of the next, thus producing a narrow slot between the two edges and a wide recess near one end.

(See Figs. 6 and 7.)

In constructing the barrel I secure the grindin g and binding plates H in position to the'ends of the barrel, and then slip the bars in between them by inserting the ends of the bars in the grooves l of the plates and slipping them close together, taking care that the large recesses are all in a line with each other at one end of the series of bars. I then bolt the screen-rims J to the projecting flanges m and to the inserted plates J so that they cover the grates or screen-bars, leaving a space between the bars and screen. The inserted plates J are secured by bolts to the flanges b of plates A.

It will therefore be seen that the plates H extend entirely across the cylinder from end to end, and that they are separated from each other by the grates or parallel series .of bars Q I, so that a ball or series of balls resting on the bottom of the barrel will be caused to travel across the plates H and lengthwise with the bars I alternately when the barrel is rotated. The finely-pulverized ore will drop through the narrow slots between the bars 'and fall upon the screen,and as the grates are elevated by 0 the rotation of the barrel the coarser portion, which fails to pass through the screen, will pass back through the wide openings or recess trinto the barrel to be again subjected to the action of the balls. 5

, By making. the plates H extend transversely across the cylinder from end to end they also serve as binding-plates to bind the ends of the barrel together, and thus furnish a plain grinding-surface for the balls and ore to pass over.

The balls and ore will then pass from one grinding-plate to the other over the length of the bars, so that they are grinding all the time.

This construction is simple and cheap, and it furnishes a complete and effective barrel grinder and pulverizer.

The plates A fit snugly about the trnnnions, or may be keyed thereto, and revolve therewith. The trunnions are suitably mounted and rotated in any approved manner. As the mounting and rotating are no part of my invention, I have not thought necessary to illustrate the means by which they are done.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In a rotary barrel pulverizer, the hollow trunnion 0, provided with flanges d e, in combination with the sections A A, which form the end of the barrel, combined and arranged substantially as described.

2. A rotary barrel pulverizer, theinner surface of which is composed of alternate binding and grinding plates H, arranged transversely across the barrel, and the interposed screenprotecting bars I, arranged in line with the travel of the balls and ore, substan tially as described.

3. In a rotary pulvorizer, the grinding and binding plates H, cast or formed witha groove, 1, in each edge, in combination with the connecting screen -bars I, substantially as described.

4. In a rotary pulverizer, the grinding and binding plates H, spaced by transverse grate or screen bars I, and having the outward projectin g flanges m at each edge, in combination with the screen J, secured to the outer edges of the flanges, substantially as and for the purpose described.

5. In a rotary pulverizer, the screen-bars I, each of which has a projecting shoulder, a, at each end on one side, and an opening or recess, t, in its opposite edge, near one end, substantially as and for the purpose described.-

In witness whereof I have hereunto set my hand,

JAMES 0. STEWART.

Attest:

W. F. CLARK, EDWARD E. ()snonn. 

